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GM gave me this printout when I took my car in for transmission service. Thought it might be useful to those that live in colder areas.

6L50 / 6L80 / 6L90

DOCUMENT ID: 1593288

HARSH, SOFT, DELAYED or SLIPPING 1-2-3-4 SHIFT

Note: On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operation temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
 
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cbeck85
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